element.oncanplaythrough = handlerFunction; var handlerFunction = element.oncanplaythrough;
handlerFunction should be either
See the DOM event handlers page for information on working with
canplaythrough event is fired when the user agent can play the media and estimates that enough data has been loaded to play the media up to its end without having to stop for further buffering of content.
canplaythrough event documentation for more information about the event.
|WHATWG HTML Living Standard
The definition of 'canplaythrough' in that specification.